US4726213A - Method of controlling a shape of a rolled sheet material - Google Patents

Method of controlling a shape of a rolled sheet material Download PDF

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Publication number
US4726213A
US4726213A US06/803,642 US80364285A US4726213A US 4726213 A US4726213 A US 4726213A US 80364285 A US80364285 A US 80364285A US 4726213 A US4726213 A US 4726213A
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Prior art keywords
shape
sheet
controlling
parameters
pattern
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US06/803,642
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Tetsuo Manchu
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Roche Diagnostics GmbH
Hitachi Ltd
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Hitachi Ltd
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Assigned to HITACHI, LTD. 6, KANDA SURUGADAI 4-CHOME, CHIYODA-KU, TOKYO, JAPAN A CORP OF JAPAN reassignment HITACHI, LTD. 6, KANDA SURUGADAI 4-CHOME, CHIYODA-KU, TOKYO, JAPAN A CORP OF JAPAN ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: MANCHU, TETSUO
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Assigned to ROCHE DIAGNOSTICS GMBH reassignment ROCHE DIAGNOSTICS GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HERSBERGER, MARTIN, NEIDHART, MICHEL, ALTWEGG, LUKAS, MAIER, WILLIBALD
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
    • B21B37/42—Control of flatness or profile during rolling of strip, sheets or plates using a combination of roll bending and axial shifting of the rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2263/00—Shape of product
    • B21B2263/04—Flatness

Definitions

  • the present invention relates to a shape controlling method for rolled sheet material.
  • the method of controlling the shape of a rolled sheet material necessitates the detection of the shape of the rolled sheet material by a shape detector and the recognition of the pattern of the detected shape.
  • the shape of the rolled sheet can be expressed in terms of distribution of factors such as the steepness, defined more fully hereinbelow, elongation, stress or sheet thickness in the breadthwise direction of the sheet.
  • Shape control is conducted by operating final control elements in such a manner that the detected shape coincides with a desired shape.
  • the actual shape is detected by a shape detector and a pattern of the detected shape is determined.
  • Attempts have been made to express the shape pattern in terms of a series to the fourth power.
  • the pattern does not always change smoothly or gently over the breadth of the rolled sheet material, and it has often been experienced that the pattern abruptly changes in regions near the with or breadthwide ends of the sheet material. It is, therefore, advisable to use a higher power series degree, e.g., sixth power, for expressing the shape pattern.
  • the shape control is conducted by operating a plurality of final control elements in such a manner that detected shape pattern coincides with the desired shape pattern. This, however, encounters the following problems.
  • a primary object of the invention is to provide a shape control method for controlling the asymmetrical shape of a rolled product so as to attain a desired shape of the rolled product.
  • Another object of the invention is to provide a shape control method which is capable of ensuring a high precision of the shape control to avoid mutual interference between final control ends.
  • a shape controlling method which comprises the steps of approximating the shape pattern of a rolled sheet material by a high order function in accordance with signals from a shape detector; separating an asymmetric fundamental component (first order component) from the asymmetric component in the above-mentioned function; and effecting the shape control by allotting the control for the fundamental component to the rolling reduction control device, while allotting higher order components to other control elements.
  • the higher order components of the asymmetric shape pattern excepting the fundamental component are delivered to a plurality of final control elements including either one or both of a work roll bending device and an intermediate roll bending device.
  • FIG. 1 shows the general arrangement of a shape control system in accordance with the invention
  • FIG. 2 is an illustration explaining the definition of the steepness of a plate shape
  • FIG. 3 shows examples of sheet shape as detected by a shape detector
  • FIG. 4 is an illustration of a high degree curve approximating the sheet shape pattern, and the asymmetric fundamental component of the shape pattern;
  • FIG. 5 is an illustration of a shape pattern and shape parameter after separation of the fundamental component
  • FIG. 6 is a diagram illustrating the shape parameters in the symmetric component
  • FIG. 7 is a flow chart of a process in which the shape is recognized by way of signals derived from the shape detector
  • FIG. 8(A) is an illustration of rolling reduction control
  • FIG. 8(B) illustrates examples of bender pressure differential control for a work roll bender and intermediate roll bender
  • FIGS. 9(A) to 9(D) show the result of simulation of the change in the shape in accordance with the operation of the final control elements.
  • a shape control system according to the present invention is, applied to, for example, a six stage rolling mill generally designated by the reference numeral 1, with a steel sheet 2 rolled by the rolling mill 1 being taken up by a tension reel 4 via a deflector roll 3.
  • the shape of the steel sheet is detected by a shape detector 5 and a shape recognition device 10 detects the shape parameters.
  • a control correction amount computing device 12 computes control correction amounts from the deviation of the shape parameters actually detected by the shape recognition device 10 from the command parameters derived from a command shape generator 11.
  • the computed control correction amounts are delivered to a work roll bending device 15, intermediate roll bending device 16, intermediate roll shift device 14 and the screw-down device 13.
  • the shape is detected by a shape of the sheet 2 detector 5.
  • the stress distribution in the breadthwise direction is measured and is converted into the thickness deviation ⁇ h (deviation of thickness from the thickness at breadthwise center), so that the shape of the sheet 2 is recognized in terms of the thickness deviation ⁇ h.
  • the shape of the sheet 2 is a concept adopted for the purpose of evaluation of the flatness of the sheet 2, from the view point of elimination of, for example, unevenness such as center buckling and edge waving.
  • the shape is expressed in terms of sheet breadthwise distribution of various factors such as steepness, elongation, stress and sheet thickness.
  • the steepness can be defined by the degree of waving of the sheet when the same is placed on a stool. More specifically, the steepness is defined as a ratio g between the amplitude and the period of the wave.
  • FIG. 3 shows the steepness as determined from the stress distribution which, in turn, is obtained through a measurement by the shape detector 5 at eleven points spaced in the breadthwise direction of the sheet 2. In this case, edge waving is formed in the sheet 2.
  • the shape attern can be approximated by the following formula (1) of the sixth degree.
  • ⁇ 1 to ⁇ 6 are shape parameters.
  • This formula representing the shape is divided into two groups: namely, symmetrical component parameters ( ⁇ 2 , ⁇ 4 , ⁇ 6 ) and asymmetrical component parameters ( ⁇ 1 , ⁇ 3 , ⁇ 5 ). It is assumed also that the symmetrical and asymmetrical components are controllable for different shape patterns by three final control elements.
  • symbols a 11 , a 12 and a 13 represent control gains, i.e., the amounts ⁇ 1 , ⁇ 3 , ⁇ 5 of the shape parameters ⁇ 1 , ⁇ 3 , ⁇ 5 which are caused when the asymmetrical final control element DM 1 is operated solely by a small amount ⁇ DM 1 .
  • symbols a 21 , a 22 and a 23 represent control gains, i.e., the amounts ⁇ 1 , ⁇ 3 , ⁇ 5 of the shape parameters ⁇ 1 , ⁇ 3 , ⁇ 5 which are caused when the asymmetrical final control element DM 2 is operated solely by a small amount ⁇ DM 2 .
  • symbols a 31 , a 32 and a 33 represent control gains, i.e., the amounts ⁇ 1 , ⁇ 3 , ⁇ 5 of the shape parameters ⁇ 1 , ⁇ 3 , ⁇ 5 which are caused when the asymmetrical final control element DM 3 is operated solely by small amount ⁇ DM 3 .
  • the values of these gains can be determined through experiments or computation by a numerical model representing the characteristics of the rolling mill.
  • the present invention provides a method of control in which the control concerning at least the component approximated by a linear function among the asymmetric shape irregularities is conducted by a specific final control element, in such a manner that there is no interference of the final control element by other final control elements.
  • FIG. 4 shows the concept of the relationship between the shape y and the asymmetric fundamental component (approximated by a linear function) y B .
  • the asymmetric fundamental component D L can be defined by the coefficient of the first order linear function which approximates the shape by minimum square method, and is given as follows:
  • x represents the coordinate value taken across the breadth of the sheet 2.
  • the ordinate axis represents the steepness in terms of sheet thickness deviation.
  • FIG. 5 illustrates the concept of the relationships between the shape y of the rolled sheet and the parameters De, Dq which are the asymmetric higher order components obtained by subtracting the asymmetrical fundamental component y B from the shape y of the rolled sheet.
  • the parameter De is defined as a variable which represents the gradient from -Xe to Xe
  • Symbols ⁇ Xe and ⁇ Xq represent predetermined points.
  • the shape parameters D L , De, Dq can be calculated by the following formula from the coefficients of the approximating function of the sixth degree.
  • the asymmetric components of the higher order shape components can be determined by the following formula (9), representing the gradient of thickness distribution between the sheet center and Xq by Cq gradient of thickness distribution between the sheet center and Xn by Cn and the gradient of thickness distribution between Xq and Xe by Ce. ##EQU5## where, ⁇ 11 to ⁇ 33 are constants which are determined by Xe, Xq and Xn.
  • step 61 the shape of the sheet 2 is approximated by function of the sixth degree, in accordance with the shape signal 51 derived from the shape detector 5.
  • the shape is, for example, as shown by the formula (1).
  • the asymmetric fundamental shape parameter i.e., the fundamental component y B of the linear function, is defined by the coefficient of the first order as shown in FIG. 4.
  • step 63 the symmetrical higher order component parameters De and Dq, other than the first order component of the asymmetrical component, are computed in the manner explained in connection with FIG. 5.
  • step 64 the parameters Ce, Cq, Cn of symmetrical components of higher orders are defined in accordance with FIG. 6.
  • the determination of the shape in the order of high number is made by defining the shape as the gradient of the steel between two points spaced in the breadthwise direction. This, however, is not exclusive and the pattern recognition utilizing Fourier series can be adopted equally well.
  • D L , Dde, Dq and Ce, Cq, Cn are determined through the process shown in FIG. 7 by the operation of the shape recognition device 10.
  • command parameter values D LS , Des, Dqs and Ces, Cqs, Cns, corresponding to respective shape parameters mentioned above are stored beforehand in a command shape generator 11.
  • the deviations of respective parameters from the command parameter values are computed by a parameter deviation computing device 30.
  • the control correction amount computing device 12 computes the control correction amounts, in accordance with the parameter deviations computed by the parameter deviation computing device 30.
  • the control with regard to the asymmetrical fundamental component D L is conducted by the rolling reduction DS serving as a final control element. It will be seen that the asymmetrical fundamental component (first order component) can approach zero because the functioning of rolling reduction usually has no stroke limit.
  • the control with regard to D L can be allotted to another final control element such as a screw-down device 13 shown in FIG. 1.
  • FIG. 8(A) illustrates the rolling reduction DS. A desired DS value is obtained by the power of the screw-down device 13 and the level control performed by a back-uproll 9 (omitted from FIG. 9).
  • the controls of De and Dq are conducted, respectively, such that the work roll bending pressure differential DFw and the intermediate roll bending pressure differential DF I coincide with respective desired values.
  • b 11 to b 33 represent the control gains explained before.
  • the control correction amount computing device computes the correction amounts ⁇ DS, ⁇ DFw and ⁇ DF I and delivers the same to respective final control elements. ##EQU7##
  • the work roll bending device and the intermediate roll bending device are utilized as the final control elements besides the functions of rolling reduction.
  • This arrangement is only illustrative and an intermediate roll shift, for example, can be used as the control element for correction of a higher order.
  • FIGS. 9(A) to 9(D) show the results of a simulation test conducted for examining the influences of respective final control element on the sheet shape.
  • FIG. 9(A) shows how the sheet shape is influenced by the operation of the work roll bender DFw when the work roll bender pressure differential F W1 , F W2 and F W3 are applied. The work roll bender pressure differentials are selected to meet the condition of F W1 >F W2 >F W3 .
  • FIGS. 9(B), 9(C) and 9(D) show how the sheet shape is influenced by changes in the intermediate roll shift amount (UC), intermediate roll bender pressure differential DF I and the rolling reduction DS.
  • UC intermediate roll shift amount
  • DF I intermediate roll bender pressure differential
  • the present invention is characterized in that the shape control is conducted in full consideration of these features of the final control elements.
  • the correction of fundamental component asymmetrical shape irregularity and the correction of higher order components of the same are conducted without causing mutual interference.
  • the correction of the asymmetric fundamental component by the rolling reduction function can be continued even after other final control element so that the roll bender has exerted its correcting ability. It is, therefore, possible to avoid undesirable zig-zagging of the steel sheet and to reduce the number of the control gains through which the control variables are related to the shape parameters can also be reduced, thus facilitating the formation of the numerical model.
  • the optimization of the control system is facilitated by adopting numerical models which express the relationship between the control variables and the shape parameters, so that the shape control can be performed with high precision.
  • the shape control by the levelling difference of the screw-down device and the shape control by other final control elements can be conducted without causing interference therebetween, so that it becomes possible to properly correct the shape of the rolled steel sheet while avoiding the zig-zagging of the same.
  • a simple, easily adjustable and effective control can be conducted by virtue of the reduction in the number of control gains through which the final control elements are related to the shape parameters.
  • FIG. 1 illustrates only the outlet side of a irreversible rolling stand of the rolling mill 1
  • the shape detector 5 may be disposed on either the inlet or outlet side of a reversible rolling stand or on both sides of each rolling stand of a continuous rolling mill having a plurality of stands.
  • the position of the point ⁇ Xq may be determined in consideration of, for example, the mean steepness.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
US06/803,642 1984-12-03 1985-12-02 Method of controlling a shape of a rolled sheet material Expired - Lifetime US4726213A (en)

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Application Number Priority Date Filing Date Title
JP59254018A JPH0638961B2 (ja) 1984-12-03 1984-12-03 圧延材の形状制御方法
JP59-254018 1984-12-03

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JP (1) JPH0638961B2 (ja)
KR (1) KR930001222B1 (ja)
CN (1) CN1030693C (ja)
BR (1) BR8506006A (ja)
ZA (1) ZA859253B (ja)

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4881396A (en) * 1987-04-09 1989-11-21 Sms Schloemann-Siemag Aktiengesellschaft Rolling mill stand with axially slidable rolls
EP0349885A2 (de) * 1988-07-08 1990-01-10 Betriebsforschungsinstitut VDEh Institut für angewandte Forschung GmbH Verfahren zum Kaltwalzen von Blechen und Bändern
WO1990000450A1 (en) * 1988-07-11 1990-01-25 DAVID McKEE (POOLE) LIMITED Rolling of strip material
US5239851A (en) * 1989-05-31 1993-08-31 Hitachi, Ltd. Rolling method of multi-high rolling mill for obtaining accurate sheet crown
US5325692A (en) * 1992-09-28 1994-07-05 Sumitomo Light Metal Industries, Ltd. Method of controlling transverse shape of rolled strip, based on tension distribution
US5375448A (en) * 1987-08-12 1994-12-27 Hitachi, Ltd. Non-interference control method and device
US5465214A (en) * 1993-09-17 1995-11-07 Gts Industries (Societe Anonyme) Method of measuring the shape and/or the planarity of a running material, and device for its implementation
US5509285A (en) * 1991-07-24 1996-04-23 Kabushiki Kaisha Toshiba Method and apparatus for measuring flatness and rolling control apparatus
US5653137A (en) * 1989-05-31 1997-08-05 Hitachi, Ltd. Five-high rolling mill
WO2001005528A1 (en) * 1999-07-20 2001-01-25 Danieli & C. Officine Meccaniche S.P.A. Method for the static and dynamic control of the planarity of flat rolled products
US6216505B1 (en) * 1999-06-25 2001-04-17 Sumitomo Metal Industries, Ltd. Method and apparatus for rolling a strip
US6314776B1 (en) * 2000-10-03 2001-11-13 Alcoa Inc. Sixth order actuator and mill set-up system for rolling mill profile and flatness control
US6374656B1 (en) 1999-07-20 2002-04-23 Danieli & C. Officine Meccaniche S.P.A. Rolling stand for plane products and method to control the planarity of said products
US6769279B1 (en) 2002-10-16 2004-08-03 Machine Concepts, Inc. Multiroll precision leveler with automatic shape control
CN101648215B (zh) * 2008-08-14 2011-07-20 宝山钢铁股份有限公司 一种连轧机的带钢边缘降控制方法
US20140060139A1 (en) * 2011-06-07 2014-03-06 Nippon Steel & Sumitomo Metal Corporation Method for cooling hot-rolled steel sheet
US20140076018A1 (en) * 2011-07-27 2014-03-20 Nippon Steel & Sumitomo Metal Corporation Method for manufacturing steel sheet
US9459086B2 (en) 2014-02-17 2016-10-04 Machine Concepts, Inc. Shape sensor devices, shape error detection systems, and related shape sensing methods
US9566625B2 (en) 2011-06-07 2017-02-14 Nippon Steel & Sumitomo Metal Corporation Apparatus for cooling hot-rolled steel sheet
US10363590B2 (en) 2015-03-19 2019-07-30 Machine Concepts, Inc. Shape correction leveler drive systems
US10710135B2 (en) 2016-12-21 2020-07-14 Machine Concepts Inc. Dual-stage multi-roll leveler and work roll assembly
US11833562B2 (en) 2016-12-21 2023-12-05 Machine Concepts, Inc. Dual-stage multi-roll leveler and metal strip material flattening method

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JPH0899109A (ja) * 1994-09-30 1996-04-16 Mitsubishi Electric Corp 圧延機の形状制御装置
JP3649208B2 (ja) * 2002-05-22 2005-05-18 株式会社日立製作所 タンデム圧延設備の制御方法及びタンデム圧延設備
JP4227497B2 (ja) * 2003-10-15 2009-02-18 株式会社日立製作所 圧延機のフィードフォワード板厚制御装置及びその制御方法
JP5439704B2 (ja) * 2006-12-18 2014-03-12 Ｊｆｅスチール株式会社 鋼帯形状検出装置
CN101507977B (zh) * 2009-03-20 2012-06-06 燕山大学 板带轧机板形检测设备系统误差综合补偿方法
JP6074096B1 (ja) * 2016-06-02 2017-02-01 Ｐｒｉｍｅｔａｌｓ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｊａｐａｎ株式会社 熱間仕上タンデム圧延機の板プロフィル制御方法および熱間仕上タンデム圧延機
US20230033169A1 (en) * 2020-01-09 2023-02-02 Panasonic Intellectual Property Management Co., Ltd. Roll press device, and control device
JP7323037B1 (ja) * 2022-10-28 2023-08-08 Ｊｆｅスチール株式会社 冷間圧延方法、鋼板の製造方法、冷間圧延設備及び鋼板の製造設備

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US4512170A (en) * 1983-09-30 1985-04-23 Kaiser Aluminum & Chemical Corporation Process and apparatus for strip flatness and tension measurements
US4587819A (en) * 1984-08-31 1986-05-13 Brown, Boveri & Cie Aktiengesellschaft Method and circuit for flatness control in rolling mills

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US4320643A (en) * 1979-01-17 1982-03-23 Hitachi, Ltd. Method and apparatus for correcting asymmetrical condition in rolling mill
US4512170A (en) * 1983-09-30 1985-04-23 Kaiser Aluminum & Chemical Corporation Process and apparatus for strip flatness and tension measurements
US4587819A (en) * 1984-08-31 1986-05-13 Brown, Boveri & Cie Aktiengesellschaft Method and circuit for flatness control in rolling mills

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Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4881396A (en) * 1987-04-09 1989-11-21 Sms Schloemann-Siemag Aktiengesellschaft Rolling mill stand with axially slidable rolls
US5375448A (en) * 1987-08-12 1994-12-27 Hitachi, Ltd. Non-interference control method and device
EP0349885A3 (de) * 1988-07-08 1991-11-13 Betriebsforschungsinstitut VDEh Institut für angewandte Forschung GmbH Verfahren zum Kaltwalzen von Blechen und Bändern
EP0349885A2 (de) * 1988-07-08 1990-01-10 Betriebsforschungsinstitut VDEh Institut für angewandte Forschung GmbH Verfahren zum Kaltwalzen von Blechen und Bändern
WO1990000450A1 (en) * 1988-07-11 1990-01-25 DAVID McKEE (POOLE) LIMITED Rolling of strip material
US5239851A (en) * 1989-05-31 1993-08-31 Hitachi, Ltd. Rolling method of multi-high rolling mill for obtaining accurate sheet crown
US5653137A (en) * 1989-05-31 1997-08-05 Hitachi, Ltd. Five-high rolling mill
US5509285A (en) * 1991-07-24 1996-04-23 Kabushiki Kaisha Toshiba Method and apparatus for measuring flatness and rolling control apparatus
US5325692A (en) * 1992-09-28 1994-07-05 Sumitomo Light Metal Industries, Ltd. Method of controlling transverse shape of rolled strip, based on tension distribution
US5465214A (en) * 1993-09-17 1995-11-07 Gts Industries (Societe Anonyme) Method of measuring the shape and/or the planarity of a running material, and device for its implementation
US6216505B1 (en) * 1999-06-25 2001-04-17 Sumitomo Metal Industries, Ltd. Method and apparatus for rolling a strip
US6374656B1 (en) 1999-07-20 2002-04-23 Danieli & C. Officine Meccaniche S.P.A. Rolling stand for plane products and method to control the planarity of said products
WO2001005528A1 (en) * 1999-07-20 2001-01-25 Danieli & C. Officine Meccaniche S.P.A. Method for the static and dynamic control of the planarity of flat rolled products
US6338262B1 (en) 1999-07-20 2002-01-15 Danieli & C. Officine Meccaniche Spa Method for the static and dynamic control of the planarity of flat rolled products
EP1195205A3 (en) * 2000-10-03 2004-05-26 Alcoa Inc. Sixth order actuator and mill set-up system for rolling mill profile and flatness control
EP1195205A2 (en) * 2000-10-03 2002-04-10 Alcoa Inc. Sixth order actuator and mill set-up system for rolling mill profile and flatness control
US6314776B1 (en) * 2000-10-03 2001-11-13 Alcoa Inc. Sixth order actuator and mill set-up system for rolling mill profile and flatness control
US6769279B1 (en) 2002-10-16 2004-08-03 Machine Concepts, Inc. Multiroll precision leveler with automatic shape control
US6792783B1 (en) 2002-10-16 2004-09-21 Machine Concepts, Inc. Quick change cassette system for multi-roll leveler
US6848289B1 (en) 2002-10-16 2005-02-01 Machine Concepts, Inc. Integrated actuator assembly for pivot style multi-roll leveler
US6857301B1 (en) 2002-10-16 2005-02-22 Machine Concepts, Inc. Displacement-type shape sensor for multi-roll leveler
US6920774B1 (en) 2002-10-16 2005-07-26 Machine Concepts, Inc. Drive system for multi-roll leveler
CN101648215B (zh) * 2008-08-14 2011-07-20 宝山钢铁股份有限公司 一种连轧机的带钢边缘降控制方法
US20140060139A1 (en) * 2011-06-07 2014-03-06 Nippon Steel & Sumitomo Metal Corporation Method for cooling hot-rolled steel sheet
US9186710B2 (en) * 2011-06-07 2015-11-17 Nippon Steel & Sumitomo Metal Corporation Method for cooling hot-rolled steel sheet
US9566625B2 (en) 2011-06-07 2017-02-14 Nippon Steel & Sumitomo Metal Corporation Apparatus for cooling hot-rolled steel sheet
US20140076018A1 (en) * 2011-07-27 2014-03-20 Nippon Steel & Sumitomo Metal Corporation Method for manufacturing steel sheet
US9211574B2 (en) * 2011-07-27 2015-12-15 Nippon Steel & Sumitomo Metal Corporation Method for manufacturing steel sheet
US9459086B2 (en) 2014-02-17 2016-10-04 Machine Concepts, Inc. Shape sensor devices, shape error detection systems, and related shape sensing methods
US10363590B2 (en) 2015-03-19 2019-07-30 Machine Concepts, Inc. Shape correction leveler drive systems
US10710135B2 (en) 2016-12-21 2020-07-14 Machine Concepts Inc. Dual-stage multi-roll leveler and work roll assembly
US11833562B2 (en) 2016-12-21 2023-12-05 Machine Concepts, Inc. Dual-stage multi-roll leveler and metal strip material flattening method

Also Published As

Publication number Publication date
CN1030693C (zh) 1996-01-17
ZA859253B (en) 1986-08-27
BR8506006A (pt) 1986-08-19
KR860004662A (ko) 1986-07-11
CN85109707A (zh) 1986-07-23
JPS61132213A (ja) 1986-06-19
JPH0638961B2 (ja) 1994-05-25
KR930001222B1 (ko) 1993-02-22

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